480 PROCEEDINGS OF THE ACADEMY OF [DeC, 



Slosson at Franconia, New Hampshire. Airs. Slosson has also sent me 

 a male taken at Richmond, Virginia, which I believe belongs to this 

 species. In this the elytra are pale brown, irrorated but scarcely 

 variegated with gray. This is the species most commonly received 

 from correspondents, and I have formerly determined it as septentri- 

 onalis Prov., but a fine series of Helicoptcras recently received from Mrs. 

 Slosson has enabled me to correct this determination. 



Genus CATONIA Uhler. 



This genus was founded by Dr. Uhler in 1895 {Proc. Zool. Soc, p. 61) . 

 It is certainly very close to Plcctoderes Spinola, which is still unknown 

 to me in nature, but it has a somewhat different aspect and undoul^tedly 

 is sufficiently distinct. I would distinguish it from Hdicoptera by its 

 narrower, more elongated form and the much shorter pronotum, which 

 forms a rounded flap behind the eyes and not a longitudinal compart- 

 ment as in Helicoptera. Dr. Uhler states that the posterior tibia? are 

 unarmed, but this is not strictly true of any of the species known to me. 

 All, including intricata, the type species, have a minute spine placed 

 much nearer the base than in Helicoptera, and in fusca there are two 

 such spines. In Catonia the basal joint of the antennse is almost 

 globular, while in all the Helicopteras known to me this joint is much 

 more elongated. The three species of Helicoptera described by Fowler 

 in the Biologia evidently belong to this genus. 



Catonia cinctifrons Fitch is unknown to me, l)ut our other seven 

 species may be separated as follows : 



Front conspicuously transversely banded, 1 



Front not distinctly banded, 4. 



1. Hind tibiffi with two small spines, elytra uniformly fuscous dotted 



with pale; inhabits California, fusca Van D. 



— . Hind tibife unispinose, 2. 



2. Elytra unicolorous, nervures impunctate, . impu7ictata Fitch. 

 - — . Elytra variegated, nervures punctate, 3. 



3. Larger, front strongly narrowed basally, this base scarcely banded, 



imva Say. 



— . Smaller, front not greatly narrowed basally, transverse bands 



two, conspicuous, picta Van D. 



4. Larger, elytral areoles with numerous incomplete transverse vein- 



lets, apex of mesonotum with a pair of ocellated black points, 



grisea Van D. 

 — . Smaller, elytra maculated, without reticulating veinlets, . . 5. 



5. Vertex and base of the front broader; elytral areoles almost im- 



maculate, with a whitish transverse band indicated across the 

 apical third of the clavus, pumila Van D. 



